/Engine/Source/Developer/ToolMenus/Public/ToolMenus.h
Generates sub menu by entry name in the given generated menu parent
[UToolMenu](API\Developer\ToolMenus\UToolMenu) * GenerateSubMenu ( const [UToolMenu](API\Developer\ToolMenus\UToolMenu) * InGeneratedParent, const [FName](API\Runtime\Core\UObject\FName) InBlockName )